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Hello @hogopiso there are quite a few ways to get free boosters in Candy Crush.
The Booster Wheel, Treat Calendar, Daily Win, Chocolate Box, Fantastic Five, and features that require you to watch adverts to name a few.
Of these, I think, the Booster Wheel is the only one that is available to everyone.
The problem you, and everyone else, has is that all the other ways of getting free boosters aren't handed out to every single player. They are instead handed out in a random fashion in what King call 'test' groups.
The result of this is that there is nothing you can do to get free boosters yourself, and all you can do is keep your game app up to date and hope that eventually you become part of one of the test groups.